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https://gitcode.com/cann/asc-devkit/blob/master/docs/zh/api/SIMD-API/basic_api/data_structures/precision_conversion.md#bfloat16_t-fp4x2_e1m2_t
doc目录下精度转换章节，bf16转fp4_e1m2给的输入超出了e1m2的表示范围，同时返回值也超出了表示范围，超过了内置数据类型章节中fp4_e1m2数据范围[-1.75, 1.75]
应给出正确示例。
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Document Link（文档链接）
https://gitcode.com/cann/asc-devkit/blob/master/docs/zh/api/SIMD-API/basic_api/data_structures/precision_conversion.md#bfloat16_t-fp4x2_e1m2_t
Issues Section（问题文档片段）
doc目录下精度转换章节，bf16转fp4_e1m2给的输入超出了e1m2的表示范围，同时返回值也超出了表示范围，超过了内置数据类型章节中fp4_e1m2数据范围[-1.75, 1.75]
Existing Issues（存在的问题）
应给出正确示例。